Consider a red giant star with a luminosity of 200 L⨀ and a radius of 50 R⨀.Using the luminosity-temperature-radius relationship (L ∝ R2T4),calculate how hot this star's surface temperature will be compared to the Sun,whose temperature is 5,800 K.

L ∝ R 2 T 4 (L/L ⨀ ) = (R/R

If an 0.8 M⨀ white dwarf could accrete matter from a binary companion at a rate of 10−9 M⨀/yr,how long would it take before it exploded as a Type I supernova?

A) 600 thousand years B) 20 million years C) 200 million years D) 600 million years E) 1 billion years A) 600 thousand years B) 20 million years C) 200 million years D) 600 million years E) 1 billion years

Exam 16: Evolution of Low-Mass Stars

Consider a 1 M_⨀ star's journey up the red giant branch.Its luminosity will change from 10 L_⨀ to nearly 1,000 L_⨀.How will its temperature and radius change as the star ascends? (Recall that L ∝ R²T⁴. )

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Question 1

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The red giant star's temperature will essentially remain constant at a value 1000 K less than it was on the main sequence due to the formation of H⁻ ions in the stellar atmosphere.Thus,if its luminosity changes by a factor of 1,000/10 = 100,then the radius will change by 100¹^⁄² = 10.

As a low-mass main-sequence star runs out of fuel in its core,it grows more luminous.How is this possible?

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The percentage of hydrogen in the Sun's core today is roughly half of what it was originally.

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Asymptotic giant-branch stars have _____ luminosities,_ radii,and _____ escape velocities.

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Question 4

The luminosity of a star depends on:

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Question 5

As a red giant star evolves,hydrogen shell burning proceeds increasingly faster due to:

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Question 6

Which star spends the longest time as a main-sequence star?

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Question 7

Using this diagram,identify the star with the smallest radius.

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Question 8

A star like the Sun will eventually become an electron degenerate white dwarf star.

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Question 9

A particular asymptotic giant branch star has approximately the same mass as the Sun but 100 times its radius.Compared to the Sun,what is the escape velocity from that star?

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Question 10

When a low-mass star becomes an AGB star and has a temperature of 3300 K,at what wavelength will it shine the brightest?

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Question 11

Stars evolve primarily because they use up the fuel in their cores.

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Question 12

A 10M_⨀ star will evolve through the same phases as a 1M_⨀ star.

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Question 13

Place the following evolutionary stages in order from youngest to oldest.

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Question 14

Consider a red giant star with a luminosity of 200 L_⨀ and a radius of 50 R_⨀.Using the luminosity-temperature-radius relationship (L ∝ R²T⁴),calculate how hot this star's surface temperature will be compared to the Sun,whose temperature is 5,800 K.

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Question 15

A star like the Sun will lose about _________ of its mass before it evolves to become a white dwarf.

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Question 16

When the Sun becomes an AGB star,its radius will be approximately 100 R_⨀.If its mass at this point will be approximately the same as it is now,how will its surface gravity as an AGB star compare to its present surface gravity as a main-sequence star? Note that g GM/R².

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Question 17

If an 0.8 M_⨀ white dwarf could accrete matter from a binary companion at a rate of 10⁻⁹ M_⨀/yr,how long would it take before it exploded as a Type I supernova?

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Question 18

What is the escape velocity from the surface of a 1 M_⨀ AGB star that has a radius of 100 R_⨀?

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Question 19

What is "degenerate" in the degenerate core of a white dwarf?

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Question 20

Showing 1 - 20 of 88

Exam 16: Evolution of Low-Mass Stars

Consider a 1 M⨀ star's journey up the red giant branch.Its luminosity will change from 10 L⨀ to nearly 1,000 L⨀.How will its temperature and radius change as the star ascends? (Recall that L ∝ R2T4. )

As a low-mass main-sequence star runs out of fuel in its core,it grows more luminous.How is this possible?

The percentage of hydrogen in the Sun's core today is roughly half of what it was originally.

Asymptotic giant-branch stars have _________ luminosities,_________ radii,and _________ escape velocities.

The luminosity of a star depends on:

As a red giant star evolves,hydrogen shell burning proceeds increasingly faster due to:

Which star spends the longest time as a main-sequence star?

Using this diagram,identify the star with the smallest radius.

A star like the Sun will eventually become an electron degenerate white dwarf star.

A particular asymptotic giant branch star has approximately the same mass as the Sun but 100 times its radius.Compared to the Sun,what is the escape velocity from that star?

When a low-mass star becomes an AGB star and has a temperature of 3300 K,at what wavelength will it shine the brightest?

Stars evolve primarily because they use up the fuel in their cores.

A 10M⨀ star will evolve through the same phases as a 1M⨀ star.

Place the following evolutionary stages in order from youngest to oldest.

Consider a red giant star with a luminosity of 200 L⨀ and a radius of 50 R⨀.Using the luminosity-temperature-radius relationship (L ∝ R2T4),calculate how hot this star's surface temperature will be compared to the Sun,whose temperature is 5,800 K.

A star like the Sun will lose about _________ of its mass before it evolves to become a white dwarf.

When the Sun becomes an AGB star,its radius will be approximately 100 R⨀.If its mass at this point will be approximately the same as it is now,how will its surface gravity as an AGB star compare to its present surface gravity as a main-sequence star? Note that g GM/R2.

If an 0.8 M⨀ white dwarf could accrete matter from a binary companion at a rate of 10−9 M⨀/yr,how long would it take before it exploded as a Type I supernova?

What is the escape velocity from the surface of a 1 M⨀ AGB star that has a radius of 100 R⨀?

What is "degenerate" in the degenerate core of a white dwarf?

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Consider a 1 M_⨀ star's journey up the red giant branch.Its luminosity will change from 10 L_⨀ to nearly 1,000 L_⨀.How will its temperature and radius change as the star ascends? (Recall that L ∝ R²T⁴. )

Asymptotic giant-branch stars have _____ luminosities,_ radii,and _____ escape velocities.

A 10M_⨀ star will evolve through the same phases as a 1M_⨀ star.

Consider a red giant star with a luminosity of 200 L_⨀ and a radius of 50 R_⨀.Using the luminosity-temperature-radius relationship (L ∝ R²T⁴),calculate how hot this star's surface temperature will be compared to the Sun,whose temperature is 5,800 K.

When the Sun becomes an AGB star,its radius will be approximately 100 R_⨀.If its mass at this point will be approximately the same as it is now,how will its surface gravity as an AGB star compare to its present surface gravity as a main-sequence star? Note that g GM/R².

If an 0.8 M_⨀ white dwarf could accrete matter from a binary companion at a rate of 10⁻⁹ M_⨀/yr,how long would it take before it exploded as a Type I supernova?

What is the escape velocity from the surface of a 1 M_⨀ AGB star that has a radius of 100 R_⨀?